61results about How to "Delay thermal runaway" patented technology

The invention belongs to the technical field of lithium ion batteries and specifically relates to a high-safety lithium manganese iron phosphate battery. The high-safety lithium manganese iron phosphate battery comprises a positive plate, a negative plate, an isolating membrane, an electrolyte and a battery shell, wherein the positive plate includes a positive pole current collector and a positive pole active material layer which is coated on a surface of the positive pole current collector; the positive pole active material layer includes the following components by weight percentage: 90wt%-96wt% of positive pole active material, 1.5wt%-5wt% of positive pole conductive agent and 2wt%-5wt% of positive pole binding agent; the positive pole conductive agent is a mixture of conductive carbon black and at least one of a carbon nano tube or graphene; and the ratio of the conductive carbon black to at least another conductive agent is 1wt%:0.5wt% to 4wt%:1wt% based on the weight percentage in the positive pole active material layer; the isolating membrane is one of a polyolefin film or a non-woven cloth film; and the electrolyte is a high-temperature-resistant electrolyte. Compared with a nickel cobalt lithium manganate ternary battery and a lithium iron phosphate battery, the high-safety lithium manganese iron phosphate battery has relatively high weight specific energy and relatively high safety performance at the same time, has a long cycle life and is suitable for popularization and application in the field of new energy vehicles.

The invention relates to a preparation method of a lithium ion battery negative pole material capable of improving the safety performance. The method comprises the following steps of: (1) slurry configuration, (2) coating, and (3) roasting and drying. According to the invention, as a negative pole tab is coated with a lithium metaaluminate film, which not only has a good electronic insulation effect, but also can effectively obstruct battery short circuit after a battery diaphragm PP (Polypropylene) or PE (polyethylene) is punctured, and at the same time the lithium metaaluminate has good ionic conductivity, thus increasing the transmission velocity of the lithium ion battery, and reducing the probability that dendritic crystal generated by lithium separation of the lithium ion battery pierces the diaphragm. The composite negative pole tab prepared by the method plays a very important role in improving high-capacity lithium ion batteries.

A power added efficiency optimizer apparatus is provided for measuring and monitoring input and output power of an amplifying device, and adjusting the load impedance seen by the amplifying device so that power added efficiency is maintained at optimum levels. A power added efficiency optimizing device includes a variable load impedance that can be controlled, at least one power detection device located after the load, a difference forming apparatus, and at least one coupling device. The power added efficiency optimizing device provides an ability to maintain an amplifier at peak efficiency in a dynamic way and in the presence of changing electromagnetic load conditions.

The invention relates to a composite negative electrode pole piece and a preparation method therefor, and a lithium ion battery for a mobile base station, and belongs to the technical field of the lithium ion battery. The composite negative electrode pole piece comprises a negative electrode current collector and a negative electrode active material layer, wherein a red phosphorus layer is arranged on the surface of the negative electrode active material layer. By virtue of the red phosphorus layer, the capacity per gram of the negative electrode material of the lithium ion battery can be given full play, and the electrochemical stability can be improved.

The invention provides a pole piece and an application thereof, and a low temperature rise safety lithium ion battery containing the pole piece, the pole piece comprises a current collector, and at least two active coatings and at least one efficient conductive PTC film are fixedly arranged on each of two opposite surfaces of the current collector; the active coating and the efficient conductive PTC film are arranged at intervals from inside to outside from the surface of the current collector, and the outermost side is the active coating; the conductivity of the active coating on the outermost layer is smaller than that of the other active coatings, and/or the active substance of the active coating on the outermost layer adopts an active substance with high thermal stability. According tothe pole piece disclosed by the invention, the internal temperature distribution is more uniform, the temperature rise of conventional use or internal short circuit of the battery is reduced, and thermal runaway can be slowed down, so that the safety of the lithium ion battery is improved.

The invention relates to an insulating heat conduction coating, which comprises the following components in part by weight: 110 to 180 parts of organic solvent, 100 to 150 parts of plastic substrate and 30 to 50 parts of inorganic filler, wherein the organic solvent is one or a mixture of more than two of tetralin, trichlorobenzene, dimethylbenzene, cyclohexanone, acetate, ethane, benzene and trichloromethane; the plastic substrate is one or a mixture of more than two of polypropylene plastics, polyethylene plastics and polyphenylene sulfide plastics; and the inorganic filler is one or a mixture of more than two of magnesium oxide powder, aluminum oxide powder and silicon carbide powder. A preparation method for the insulating heat conduction coating comprises the following steps of: performing hot melting, stirring and mixing. The insulating heat conduction coating serving as a main layer is coated in an inner cavity of a metal shell of a lithium ion battery, so that the heat dissipated by the battery in the using process can be led out quickly; and the integral shell is insulated from the battery to prevent electrolyte in the long-term using process from corroding the metal shell, so the thermorunaway and sealing failure of the lithium ion battery can be reduced effectively.

The invention provides a heat-insulating composite material for delaying heat diffusion of an electric vehicle battery. The heat-insulating composite material comprises a silicone rubber layer and aninorganic fiber layer. The heat-insulating composite material prepared according to the technical scheme of the invention has high heat-insulating property and compressibility and can be applied to the electric vehicle battery to reduce thermal runaway of the battery.

The invention discloses a battery provided with a thermoelectric common channel with functions of temperature equalization and heat conduction, and end cover groups of the battery; the battery provided with the thermoelectric common channel with the functions of temperature equalization and heat conduction comprises a plurality of battery pole rolls and the two end cover groups, wherein each battery pole roll comprises a central component and at least one pole piece; the two ends of the central component are respectively provided with a bending part; each pole piece at least comprises a positive pole layer and a negative pole layer; each pole piece is wound outside each central component; the battery pole rolls are configured in an abreast way; terminal arrangement parts are formed by the bending parts arranged at the two ends of the central components; and the two end cover groups are respectively arranged on the terminal arrangement parts. A heat conduction part of the battery is connected with a cooling device arranged outside the battery, so that the heat in the battery can be rapidly taken away, the temperature difference of all batteries in a battery pack can be reduced, and the occurrence of thermal runaway can be further reduced.

The invention provides a ceramic microsphere, a diaphragm containing the ceramic microsphere and a lithium ion battery containing the diaphragm. Different from a conventional diaphragm of a lithium ion battery, the diaphragm disclosed by the invention is mainly characterized in that two high-safety coated microspheres, namely conductive microspheres and ceramic microspheres, of thermosensitive blocking lithium ions and thermosensitive conduction electrons are prepared by adopting a polymer coating method, and the two high-safety coated microspheres are applied to the diaphragm of the lithium ion battery. The diaphragm of the lithium ion battery has two functions, namely a thermosensitive lithium ion blocking function and a thermosensitive conduction function, and the safety performance ofthe lithium ion battery can be effectively improved.

The invention discloses a lithium-ion battery fire extinguishing agent and a preparation method thereof, and belongs to the technical field of fire extinguishing agents. The lithium-ion battery fire extinguishing agent is prepared from the following components in percentage by weight: 10-20% of dodecyl fluoride-2-methyl-3-pentanone, 15-35% of fluorocarbon surfactants, 10-15% of glycol, 1-3% of ethanol, 0.5-3% of polypropylene acid, and the balance of water. The preparation method of the lithium-ion battery fire extinguishing agent is simple and easy to operate, used components have high safety, and damage to environments and human bodies is not prone to being left; and according to the lithium-ion battery fire extinguishing agent, the dodecyl fluoride-2-methyl-3-pentanone and water vapor are gasified by absorbing heat, the temperature of ignition positions is lowered, the re-ignition probability of lithium battery fire disasters is reduced, flame can be effectively coved through cooperation with foam, the problem of contents flying out when a lithium battery burns is solved, the possibility of new ignition point generation is reduced, and the spread of the lithium battery fire disasters is inhibited.

The embodiment of the invention provides a battery pack temperature detection system and method. Temperature of a plurality of temperature points in a battery pack, which is detected by a battery management system, is combined with an infrared thermal imaging total graph of all battery cells in the battery pack; the temperature of each single battery in the battery pack is calculated on the infrared thermal imaging total graph by taking the temperature of the temperature point as the reference temperature, so that the temperature of each single battery in the battery pack can be comprehensively acquired, the temperature abnormity in the battery pack can be early warned and controlled in advance, and the risk of thermal runaway of the battery pack and even vehicle combustion is reduced.

The invention belongs to the technical field of batteries, and particularly relates to an explosion-proof combination valve which comprises an explosion-proof cavity (1) provided with a through hole (11), an outer explosion-proof sheet (2) arranged above the through hole (11), and an inner explosion-proof sheet (3) arranged below the through hole (11); the explosion-proof cavity (1), the outer explosion-proof sheet (2) and the inner explosion-proof sheet (3) form a closed space for accommodating an explosion-proof material, the explosion-proof material is accommodated in the closed space, andthe inner explosion-proof sheet (3) is broken under set conditions to release the explosion-proof material into the battery. Thermal runaway in the battery can be slowed down, and the safety of the battery is improved. In addition, the invention also discloses a top cover and a battery.

The invention relates to the technical field of hybrid electric vehicles, in particular to a separate power battery thermal management system combining ultra-thin copper plates with a composite phasechange material. The system includes a power lithium battery pack, a foamy copper/paraffin composite phase change material and copper plates. The foamy copper/paraffin composite phase change materialcomprises polyurethane soft foamy copper and a phase change material filling the inside of the polyurethane soft foamy copper. One side of each copper plate is fixed on the largest side of each lithium battery body, and the other side of each copper plate is fixed among the foamy copper/paraffin compound phase change material. The system further includes radiating fins which are fixed on one sideof the copper plates. The beneficial effects are as follows: the system has a simple structure and low manufacturing lost; the copper plates increase the contact area with the surfaces of the batteries, make the temperature distribution on the surfaces of the batteries more uniform, separate the heat source from the phase change material module and overcome a series of safety problems caused by the leakage of the phase change material; and the system has a better heat dissipation function.

The invention discloses a battery pack. The battery pack comprises a shell, a plurality of battery modules and a supporting piece, the battery modules are sequentially arranged in the shell, and every two adjacent battery modules are electrically connected through an electric connecting piece; and the supporting piece is made of a heat-resistant insulating material, is arranged in the shell and is used for fixing the electric connecting piece. The inventor discovers that the main reason of thermal runaway of the battery pack is that after an output pole seat for supporting an output pole of a battery module is thermally melted, an electric connecting piece electrically connected with the output pole shifts and is in contact with other conductive pieces to cause short circuit in the battery pack, so that the improved battery pack comprises a supporting piece which is made of a heat-resistant insulating material; and the supporting piece is used for fixing the electric connecting piece, and the supporting piece is supported by the heat-resistant insulating material, so that the supporting piece is not easy to thermally melt, the electric connecting piece can be prevented from shifting, and the safety of the battery pack can be improved.

The invention provides a liquid cooling module and an electric vehicle. The liquid cooling module comprises a liquid cooling cavity having a receiving chamber; an liquid inlet pipe disposed on the lower portion of a bracket and communicating with the receiving chamber of the liquid cooling cavity; an liquid outlet pipe disposed on the lower portion of the bracket and communicating with the receiving chamber of the liquid cooling cavity; a coolant flowing from the liquid inlet pipe, received in the receiving chamber of the liquid cooling cavity, and flowing out from the liquid outlet pipe; anda battery module disposed in the receiving chamber of the liquid cooling cavity and immersed in the coolant. The liquid cooling module can improve the heat dissipation efficiency of a battery cell ofthe battery module, and balances the temperature of the battery core in the battery module.

The invention relates to a battery assembly of a CTP configuration, an electric vehicle and a design method. Comprising a battery box body and a battery pack arranged in the battery box body, the battery pack comprises a battery module with a CTP structure, a box body cross beam, a water cooling plate, a box body front end plate, a heat-conducting structural adhesive, a box body rear end plate and a water pipe joint; the battery box body comprises a box body front end plate, a box body rear end plate, a box body bottom plate and box body side plates; the battery module is fixed on the water cooling plate; the battery modules in the length direction of the battery box body are separated by box body cross beams; the battery modules in the width direction of the battery box body are separated by a water cooling plate; the water pipe connector is connected with a runner of the water cooling plate. Integration of the water cooling plate and the box body side plate can be achieved, the water cooling plate assembly, the box body rear end plate and the box body front end plate form a closed heat management cooling liquid flow channel loop, the water pipe connector is externally connected, dry-wet separation and water-pipe-free design in the battery pack can be achieved, the assembly performance is improved, and the assembly efficiency is improved. And the leakage risk caused by the water pipe adapter is reduced.

The invention relates to a high-safety diaphragm as well as a preparation method and application thereof. The preparation method comprises the steps of (I) mixing a fluorocarbon polymer, an inorganic ceramic material and a plasticizer, and heating to obtain mixed granules; (II) laminating the mixture to obtain flaky blanks; (III) rolling the flaky blanks to obtain diaphragms; (IV) coating the surfaces of the diaphragms with an isolating agent, and stacking and laminating a plurality of diaphragms of which the surfaces are coated with the isolating agent to obtain a multi-layer diaphragm; (V) rolling the multi-layer diaphragm to obtain multiple films; and (VI) performing extraction pore-forming on each film, and heating to obtain the high-safety diaphragm. According to the preparation method, the requirement of fluidity of slurry can be avoided, the diaphragm with relatively high inorganic ceramic material content can be generated, and the safety of the diaphragm is effectively improved; and the yield can be improved, and the thickness and pores of the diaphragm are easy to control.

The invention relates to a battery module thermal runaway early warning control method. The early warning control method comprises the following steps: respectively judging whether the temperature rise rate, the voltage and the air pressure rise rate of the battery module meet corresponding preset thresholds or not; if one of the temperature rise rate, the voltage and the air pressure rise rate meets a corresponding preset threshold value, sending a first processing measure signal to the battery module, wherein the first processing measure signal indicates that the battery module is circularly cooled through the cooling liquid; and if at least two of the temperature rise rate, the voltage and the air pressure rise rate meet the corresponding preset threshold values, sending a second processing measure signal to the battery module, wherein the second processing measure signal indicates the battery module to carry out thermal runaway early warning and the battery module is poured through the cooling liquid. The probability of thermal runaway can be reduced before thermal runaway of the battery module occurs, and thermal runaway early warning can be given out in advance, so that passengers can evacuate in advance when thermal runaway occurs.

The invention provides an electrochemical power supply diaphragm, a preparation method thereof and an electrochemical power supply. The electrochemical power supply includes an oxidation-treated aluminum net and an organic binder and inorganic powder composite layer coating the aluminum net surface. The preparation method of the electrochemical power supply diaphragm comprises the following steps: aluminum net oxidation treatment, organic-inorganic suspension preparation and film forming treatment of organic-inorganic suspension on the aluminum net surface. The electrochemical power supply includes the electrochemical power supply diaphragm. The electrochemical power supply diaphragm uses the surface-oxidized aluminum net as a diaphragm matrix, the resistance temperature, heat dissipation performance and dimensional stability of the electrochemical power supply diaphragm can be effectively improved, and the preparation method has the advantages of simple process, easily-controlled conditions, high production efficiency, low production cost and suitability for industrialized production.

The invention relates to the technical field of thermal runaway of batteries, and discloses a battery upper box assembly capable of delaying thermal runaway and a battery assembly. The battery upper box assembly capable of delaying thermal runaway comprises an upper box body and an explosion-proof valve, a containing cavity and a gas channel which are isolated are defined in the upper box body, cooling liquid is arranged in the containing cavity, the gas channel is located below the containing cavity, and the upper box body is configured in the mode that when thermal runaway happens to a battery monomer, the wall face between the containing cavity and the gas channel can be broken to enable the containing cavity to be communicated with the gas channel, a gas inlet communicated with the gas channel is formed in the upper box body, the first circulation area of the gas inlet is larger than the second circulation area of an outlet of the gas channel, and the anti-explosion valve is arranged on the upper box body. And the explosion-proof valve is configured to enable the gas to rush out of the explosion-proof valve when the pressure of the gas at the outlet of the gas channel is higher than preset pressure. The battery upper box assembly capable of delaying thermal runaway disclosed by the invention has the function of delaying thermal runaway of the battery monomer.

The invention discloses a battery heat-insulation flame-retardant explosion-proof system, and relates to the technical field of battery heat management. The system comprises a matrix layer and an excitation material pipeline, wherein the matrix layer wraps a battery cell and is made of a foaming material, and the excitation material pipeline is arranged outside the matrix layer; and an excitation material used for exciting the foaming material to enable the foaming material to be subjected to phase change curing is stored in the excitation material pipeline, and the excitation material can automatically flow out of the excitation material pipeline under the action of a high temperature. The foaming material matrix layer is wrapped outside the battery, and heat transfer to adjacent batteries is reduced by utilizing the heat insulation property of the foaming material so that other batteries are prevented from being affected; meanwhile, by utilizing the heat absorption expansion performance of the foaming material, the temperature of the battery is reduced, gaps among the batteries are further extruded, and flame propagation is blocked; and the active protection mode integrating cooling, isolation, flame retardance and explosion prevention is effectively achieved, safety and high efficiency are achieved, the risks of battery thermal runaway and battery reburning caused by a linkage effect are reduced to a certain degree, and accidents are prevented from further expanding.